WO1996036031A1 - Electronic license plate architecture - Google Patents
Electronic license plate architecture Download PDFInfo
- Publication number
- WO1996036031A1 WO1996036031A1 PCT/US1996/006196 US9606196W WO9636031A1 WO 1996036031 A1 WO1996036031 A1 WO 1996036031A1 US 9606196 W US9606196 W US 9606196W WO 9636031 A1 WO9636031 A1 WO 9636031A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- license plate
- antenna
- electronic
- information
- vehicle
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/10—Registration, licensing, or like devices
Definitions
- the present invention generally relates to electronic license plates and electronic signs for use in electronic vehicular identification and communication systems as well as in vehicle to roadside or vehicle to vehicle communication systems. More specifically, it relates to electronic license plate architectures wherein permanent or restricted information is electronically embedded in electronic components in the license plate portion of the system and the remaining system electronics reside in other structures.
- a road antenna from an automatic vehicle identification system receives, by radio, data from an identification transponder which is separate from the license plate and is located inside the vehicle.
- an electronic module separate from the license plate accomplishes the goal of providing both electronic and visual information
- the Sterzer electronic license plate has a plurality of layers.
- the top layer is an electrically non-conductive layer having visual information printed on it where the visual information is similar to the information on a conventional license plate.
- Behind the top layer are two antenna networks disposed on both sides of a dielectric substrate, a harmonic generator, a signal detector, a connector, internal memory, and an integrated circuit chip to provide the encoder function of the system.
- This dielectric layer thus serves as a substrate upon which the electronic components of the system are placed and interconnected by printed wire connections.
- the antenna networks can receive an interrogation signal from a microwave transmitter and transmit an identification signal in response to the interrogation signal.
- the Sterzer license plate derives a harmonic signal from the interrogation signal and re-radiates the identification signal at the harmonic frequency.
- the license plate may further receive external coding from the vehicle.
- Integrated electronic license plates are relatively expensive as compared to conventional license plates. Integrated electronic license plates not only include the visual information and structure that conventional license plates have, but also include a number of more costly components, such as the antenna network, the communications electronics and the signal processing electronics. Many states require that license plates are replaced periodically to ensure the integrity of the structure and the quality of the visual information. The expense associated with periodically replacing integrated electronic license plates such as described by Sterzer, however, could be unacceptable.
- Integrated electronic license plates integrate all the electronics into a single unit. In many circumstances, however, it is desirable to have both permanent, or restricted, information, such as the license plate number or vehicle identification number, and variable information, such as billing information for toll collection or permit information.
- the restricted information is preferably stored in a secure location, such that only the issuing authority has access to modify such information while easily accessible electronics would preferably be provided for the variable information such that many organizations could access and utilize them.
- the electronics storing such information is not configured in such a manner to allow both secure, permanent information and variable information stored in flexible electronics.
- an electronic license plate can convey more information electronically than a standard license plate can visually, the electronic license plate has many additional uses, such as for obtaining vehicle classifications or permits, billing purposes in an electronic toll collection system or a restricted access road system. Because important information is contained on the electronic license plate, it is desirable that the electronic portion of the license plate is secure. More specifically, it is desirable that the portion of the electronics carrying restricted information about a specific vehicle such as the license plate number, expiration date or the vehicle identification number is secure such that they cannot be stolen and switched to another vehicle. It is also desirable, however, that the electronic license plate system provides flexibility in use, such that license plates can be replaced at a relatively low cost and that additional electronic information can be programmed into the system if desired without jeopardizing the integrity of the secured restricted information.
- electronic road signs have been developed for unidirectional or bi-directional communication between vehicles and the roadside, such as for in-vehicle signing.
- An electronic road sign has a surface with printed visual information for visual communication of desired information, such as toll collection, traffic control information or dangerous condition warnings.
- the electronic road sign also has a transmitter to electronically transmit information associated with the road sign.
- In-vehicle signing allows a vehicle on the roadway to electronically receive the information from the roadside transmitter and display the information inside the vehicle. Also, the information can be communicated by audio within the vehicle.
- the electronic road sign may also have a receiver to receive information from the vehicle, such as in toll collection to verify transactions, or from traffic management centers to update the message information to be delivered to a vehicle.
- the present invention describes an electronic license plate architecture wherein a license plate portion communicates information visually and also has an identification device integrated in it.
- the identification device stores restricted information.
- a license plate holder supports the license plate portion as well as houses the electronics.
- An antenna for electromagnetic communication is placed either in the license plate portion or in the license plate holder.
- Figure 1 is a perspective view of a roadway intersection where electronic signs and electronic license plate systems have been installed
- FIG. 2 is a schematic diagram of the electronic license plate system of the present invention.
- Figure 3 is an exploded view of an electronic license plate portion of the present invention
- Figure 4 is a partially exploded view of the electronic license plate system of the present invention
- Figures 5a and 5b are a top view and a side cross-sectional view of a portion of an identification device of the present invention.
- Figure 6 shows the portion of the identification device of Figures 5a and 5b folded in half
- Figure 7 shows the identification device of Figure 6 enclosed by molding and installed in a license plate substrate
- Figure 8 is a schematic diagram of another embodiment of the electronic license plate system of the present invention.
- Figure 9a and 9b are front and exploded views of a the electronic license plate system with the antenna integrated with the holder portion;
- Figure 10 is an antenna radiation pattern of the antenna shown in Figures 9a and 9b;
- Figures 1 la and 1 lb are front and exploded views of another embodiment of the electronic license plate system with the antenna integrated with the holder portion;
- Figure 12 is an antenna radiation pattern of the antenna shown in Figures 11a and l ib;
- Figure 13 is a side cross-sectional view of a license plate portion being inserted into a license plate holder portion
- Figure 14 is a side cross-sectional view of a license plate portion installed in a license plate holder portion
- Figure 15 shows the electronic license plate system of the present invention having a remote electronic module.
- Figure 1 is a perspective view of a roadway intersection where electronic signs have been installed and some vehicles are equipped with electronic license plates.
- Integrated electronic signs 2 in the form of a STOP sign and a street sign, communicate information to drivers of vehicles both visually and electromagnetically.
- Signs 2 are connected by cable 4 to interface unit 6, which may include a power source, electronics or a communication interface with a central traffic management center.
- Interface unit 6 is preferably buried in the ground to avoid congesting the roadside and to protect the components within the unit.
- Vehicles in the form of bus 10 and truck 12 include integrated electronic signage in the form of license plates (not shown), which are similar to signs 2 and communicate information both visually and electromagnetically.
- Antennas within signs 2 radiate fields 8, which communicate information electromagnetically.
- the electronic license plate of bus 10 is interactive, with a receive and a send mode, and radiates field 14 when sending information electromagnetically
- the electronic license plate of truck 12 includes a less complex antenna system such as a passive backscatter system, and does not radiate a field.
- FIG 2 is a schematic diagram and Figure 4 is an exploded view of an electronic license plate system of the present invention.
- Electronic license plate system 20 has two main portions, license plate portion 22 and license plate holder/electronics portion 24.
- Figure 3 is an exploded view of license plate portion 22.
- License plate portion 22 contains a conventional license plate, such as those typically issued by a Department of Motor Vehicles of a state.
- the conventional license plate contains visual information 26, such as the license plate number, the expiration date of the license plate and the state issuing the license plate.
- retroreflective sheeting 28 is often applied to license plate 22.
- Retroreflective sheeting 28 has an optically retroreflective surface such as 3M brand ScotchliteTM Reflective License Plate Sheeting, manufactured by Minnesota Mining and Manufacturing Company of St. Paul, Minnesota, and printed with the appropriate vehicle designation.
- License plate portion 22 further can include antenna 30 for electromagnetic communication with other similarly equipped vehicles, electronic signs or other systems equipped with antennas for electromagnetic communication.
- Antenna 30 can be any type of suitable antenna.
- antenna 30 is a planar antenna, such as a microstrip patch antenna placed on dielectric substrate 31.
- Conductive substrate 27 acts as a ground plane for antenna 30, conductive substrate 27 having an aperture 29 therethrough for aperture coupling to a transmission line (not shown) on the license plate holder portion 24 of the system.
- Conductive substrate 27 can further have an opening 33 therethrough or other suitable fastening means for placement of identification device 32.
- An example of such an electronic license plate having an integrated antenna is described in commonly-assigned U.S. Patent Application Serial Number 08/196,294 entitled “Integrated Retroreflective Electronic Display” to Bantli et al., filed February 14, 1994.
- the antenna may be placed in license plate holder portion to simplify the components in license plate portion, to keep all electrical components, besides the secure identification device, together, and to lower costs on the replaceable portion of the system, namely the license plate portion.
- Figure 8 shows an electronic license plate system that is the same as the electronic license plate system shown in Figure 2 except that antenna 30 is located in license plate holder portion 24 instead of license plate portion 22. It is preferable that antenna 30 is located in a standard location, such as behind the license plate.
- potential problems arise because typical license plate retroreflective sheeting contains a vapor coat layer that disrupts a radiation pattern if an antenna is placed behind the retroreflective sheeting. Further, even if no retroreflective sheeting is used, or a purely dielectric retroreflective sheeting is used, the majority of license plates have a metal backing, such as aluminum, for support. Therefore, an alternative antenna location is desirable.
- Figures 9a and 9b show an alternative antenna location that positions the antenna in the preferred license plate location while allowing the radiation pattern of the antenna to avoid the vapor coat layer of the retroreflective sheeting or the metal substrate of the license plate portion.
- Figure 9a shows a front view of license plate portion 22 attached to license plate holder 34. While antenna 100 is physically behind license plate holder 34, it is shown through holder 34 in Figure 9a to show its positioning with respect to license plate portion 22.
- Figure 9b shows an exploded view of the electronic license plate system.
- License plate portion 22 has identification device 32 mounted on its rear face.
- License plate holder 34 includes bracket structure 104 and radome 102. Antenna 100 is positioned on a peripheral edge of bracket structure 104, thereby avoiding license plate portion 22.
- Antenna 100 is shown as a microstrip dipole antenna, which is preferably made of copper, although any suitable conductive material may be used.
- Microstrip dipole antenna 100 is connected to probe feed 106 which is connected to transmission line 108.
- Transmission line 108 transmits signals from antenna 100 to the communications electronics, not shown.
- aperture coupling may be used to electromagnetically transmit information from antenna 100 to transmission line 108.
- Opening 110 accommodates identification device 32 an allows for connection of identification device 32 with the electronic module.
- Radome 102 is placed around the periphery of bracket structure 104 and over antenna 100 to provide protection for antenna 100. Radome 102 may be laminated, welded or fastened in any other permanent or temporary manner.
- Bracket structure 104 is made of plastic or any suitable non-conductive material and is formed to support license plate portion 22. Because bracket structure 104 acts as the dielectric for microstrip dipole antenna element 100, the material used to manufacture bracket structure must have a suitable relative dielectric constant, such as a dielectric constant between 1.0 to 11.0.
- Figure 10 shows an antenna radiation pattern for an embodiment of the present invention as shown in Figures 9a and 9b.
- Figure 10 is an E-plane radiation pattern when antenna 100 is operating at 905 MHz.
- the gain of the antenna is approximately 4.12 dBi and the beamwidth of the radiation pattern in approximately 84.73 degrees.
- a microstrip dipole antenna is shown in Figure 9b, any planar antenna that fits along the outer periphery of support 104 may be substituted for a microstrip dipole antenna.
- a microstrip patch or microstrip patch array may be used as antenna 100.
- Figure 11a and lib show another example of another type of antenna that may be used with the present invention.
- Figure 11a shows a front view of the electronic license plate system with license plate portion 22 and license plate holder 34. Similar to Figure 9a, loop antenna 120 is shown through license plate holder 34 to illustrate its positioning with respect to license plate portion 22. Loop antenna 120 is actually positioned within or embedded in bracket structure 122. Bracket structure 122 may be layered, with loop antenna 120 positioned between the layers, may be hollow, with loop antenna 120 located in the hollow portion, or may be molded around loop antenna 120. Bracket structure 122 further is formed to support license plate portion 22 and to accommodate identification device 32, such as with opening 124, to allow connection to the electronics.
- Figure 12 shows an E- plane radiation pattern for loop antenna 120 operating at 920 MHz. The gain of antenna 120 is approximately 0.93 dBi and the beamwidth approximately 38.65 degrees.
- Identification device 32 is embedded in license plate portion 22 to provide electronic iizformation to the system, and more preferably, permanent electronic information. Permanent electronic information is information that should not change, such as the license plate number associated with a license plate or the vehicle identification number of the vehicle to which the license plate is attached. Identification device 32 may be any suitable electronic components, such as a write-once read-many (WORM) type memory device or an electrically programmable read only memory (EPROM).
- WORM write-once read-many
- EPROM electrically programmable read only memory
- identification device 32 Because the permanent information stored in identification device 32 is information that should not change, it is preferable that the permanent information is programmed into identification device 32 at the time of manufacture or under the control of authorities such as the Department of Motor Vehicles before issuance of the license plate unit, which would include both the conventional visual information as well as the electronic information stored in identification device 32 and, possibly, antenna 30. As mentioned above, the remaining electronics are not integrated with the license plate portion in the present invention. While the information stored in the identification device is preferably strictly controlled by some issuing authority, the electronics for reading the information from the identification device and for providing other communications, signal processing and data processing functions is preferably accessible to organizations other than just the issuing authority.
- the remainder of the electronics can vary, based on the types of applications the electronics need to handle.
- the electronics could be add-on modules to be installed in existing vehicles or could be integrated into vehicles at the time of vehicle manufacturing. Moreover, by placing the electronics in areas other than within the license plate portion, the costs of replacing the license plate portion are reduced.
- license plate holder/electronics portion 24 is comprised of two structures, license plate holder 34 and electronic module 36.
- License plate holder 34 is a mechanical fastening system for holding license plate portion 22 securely to the vehicle.
- license plate holder 34 may be any fastener such as bolts or screws placed through holes in license plate portion 22 and screwed into a predetermined area on the vehicle. In other embodiments, however, license plate holder 34 may fasten license plate portion 22 in a such manner to protect tampering with identification device 32, as will later be described.
- license plate holder 34 may include an interface between license plate portion 22 and electronic module 36 when electronic module is not placed in a proximate location with respect to license plate portion 22.
- Electronic module 36 preferably resides in license plate holder portion 24 as shown in Figure 2.
- Electronic module 36 may reside, however, in other areas of the vehicle, such as in the trunk or dashboard of the vehicle.
- Electronic module 36 contains communication electronics 38 and signal processing electronics 40.
- Communication electronics 38 includes antenna 30 in those embodiments where antenna 30 is not integrated into license plate portion 22.
- Communication electronics 38 further includes radio frequency (RF) electronics to transmit or receive an RF signal from antenna 30.
- RF electronics include those components well known in the art such as modulation and demodulation circuits for converting signals between digital and analog formats, a field strength detector, a receive detector, and a decoder for receiving signals and a transmit oscillator/modulator and a transmit power amplifier for transmitting the modulated RF voltage to antenna 30.
- RF electronics include those components well known in the art such as modulation and demodulation circuits for converting signals between digital and analog formats, a field strength detector, a receive detector, and a decoder for receiving signals and a transmit oscillator/
- Signal processing electronics 40 are used to encode or decode the signal to and from the RF electronics and may be a passive or activt system. Signal processing electronics 40 make logic decisions based on instructions contained in the received signal and execute the transmission protocol. Moreover, using the information stored in identification device 32, they format a message into a digital bit stream to be transmitted, the formatted message sent to the transmit circuit of radiofrequency electronics in communication electronics 38. Signal processing electronics 40 may include a receiver decoder for decoding the digital signal into a binary bit stream, a protocol logic unit for decoding the protocols and may also include electronics monitoring the status of power source 42. Signal processing electronics 42 may further include electronics for data processing. Communications electronics 38 are preferably located close in proximity to antenna 30 to minimize RF losses. Thus, in an embodiment where antenna 30 is placed in license plate portion 22, it is preferable to place at least communications electronics 38 in license plate holder portion 24.
- identification device 32 is mounted on the license plate portion of the system. While license plate portion 22 interfaces with the electronics in holder 24, it is preferable that license plate portion 22 cannot be removed without destroying license plate portion 22 or identification device 32, rendering the system inoperable or transmitting an alarm signal to alert the authorities of potential tampering. Further, it may prevent electromagnetic communication using the system when an improper identification device is connected to the electronics in the vehicle. This ensures the accuracy of the permanent, vehicle-specific information sent from identification device 32 to an interrogating unit, and the integrity of the entire system. Examples of systems that prevent tampering with the electronic license plate are described in commonly- assigned U.S.
- FIGS 5a and 5b show a top view and a side cross-sectional view of a chip mounting device used in a second embodiment of the present invention.
- the second embodiment as shown in Figures 5a, 5b, 6, and 7 prevents the identification device mounted on the license plate portion of the system from being removed without destroying the device. This prevents removal of the identification device from a first vehicle and remounting the device on a second vehicle.
- identification chip 52 such as a semiconductor chip, a WORM type of memory or an EEPROM is mounted on flexible substrate 50.
- Flexible substrate may be any flexible circuit substrate, such as Kapton® film, manufactured by E.I. DuPont DeNemours, Wilmington, DE, having a first side 58 and a second side 60.
- Conductive lines 54 such as coppei microstrip lines, electrically connect identification chip 53 to conductive feed through 56.
- Conductive lines 54 may be rolled copper with conductive adhesive or may be formed using any printed circuit board techniques, such as etching.
- Conductive feed through 56 are preferably copper, thereby providing a conductive path from first side 58 of flexible substrate 50 to second side 60 of flexible substrate 50.
- Connector 62 is mounted on second side 60 of flexible substrate 50. Feed throughs 56 have means for mounting a connector on second side 60 of substrate 50, such as surface mounting pads.
- Connector 62 may be any connector designated by system requirements, such as a three pin surface mounted connector, as shown.
- Three pin surface mounted connector 62 has three pins 66 (only one shown), each pin 66 connected to conductive feed through 56.
- Base 64 provides support to pins 66.
- the entire structure is preferably coated with a protective, con-conductive coating, such as FluoradTM, manufactured by Minnesota Mining and Manufacturing Company, St. Paul, Minnesota, to protect from corrosion. During the coating process, connector pins 66 are masked.
- identification chip 52 and conductive feed throughs 56 are positioned on flexible substrate 50 such that flexible substrate 50 can be folded, preferably in half lengthwise, such that identification chip 52 and conductive lines 54 are positioned on the inner periphery of the folded electronic module and connector 62 is positioned on the outer periphery of the folded electronic module.
- the folding may be achieved by die cutting the Kapton® film, as indicated by the dotted lines in Figures 5 a and 5b, except for the portions of the film where conductive lines 54 are located.
- the inside of the folded electronic module can be filled with an epoxy or a non-conductive filler film to provide further structural integrity.
- Figure 7 shows the folded electronic module, or the identification device, v installed in a license plate.
- a molded structure is formed around the folded electronic module shown in Figure 6.
- Molded structure 68 is preferably formed of
- Substrate 70 of the license plate portion has an outer side 74 and an inner side 72. Molded structure 68 is preferably pressed through outer side 74 of substrate 70 and is sized to snap into the opening and lock into place. Connector pins 66 extend out from inner side 72 of substrate 70 to connect with a matching connector in the license plate holder portion of the system.
- license plate portion is attached to license plate holder portion 24.
- License plate portion 22 may be permanently connected to license plate holder portion 24 and also permanently attached to the vehicle.
- the electronic license plate system 20 is permanently attached to the vehicle for the duration of the validity of the license plate.
- the entire license plate need be destroyed to remove it from the vehicle, thereby ensuring that the license plate may not be remounted in a holder of another vehicle.
- FIG 13 shows license plate portion 22 being inserted into license plate holder 34.
- License plate holder 34 may be attached to the vehicle using any suitable fasteners, such as screws 132.
- Guide pin 134 ensures that license plate portion 22 is correctly aligned with license plate holder 34 such that connector 130 adequately connects the identification device mounted on license plate portion 22 to the electronics and aperture 142, if present, adequately aperture couples the antenna to the electronics.
- connector 130 is connected to the electronics, such as a printed circuit board 140, as shown in Figure 14 or a separate electronic module 150, as shown in Figure 15. As mentioned above, even if some electronics reside in electronic module 150, other electronics, such as the communications electronics, may still be placed in holder 34.
- license plate portion 22 may be secured using any suitable fastener, such as screws 136.
- insertion guides or locks 138 may be used depending on the system requirements. If the license plate portion 22 is removable, guides are used. Guides 138 are rounded towards the license plate to make insertion and removal possible while at the same time pressing the license plate portion 22 toward holder 34. The force applied by guide 138 preferably ensures an environmental seal between license plate portion 22 and holder 34 to protect connector 130. If a permanent installation is desired, however, then guides 138 have a sharper edge and fit into matched slots in license plate portion 22, thereby securing themselves to the edges of the slots and preventing removal of license plate portion 22.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU56732/96A AU692390B2 (en) | 1995-05-11 | 1996-05-02 | Electronic license plate architecture |
JP8534133A JPH11505050A (en) | 1995-05-11 | 1996-05-02 | Electronic license plate with safety identification device |
CA002218985A CA2218985C (en) | 1995-05-11 | 1996-05-02 | Electronic license plate architecture |
EP96913910A EP0826204A1 (en) | 1995-05-11 | 1996-05-02 | Electronic license plate architecture |
BR9608242A BR9608242A (en) | 1995-05-11 | 1996-05-02 | Electronic license plate system for use in an electronic vehicle communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/438,951 US5608391A (en) | 1995-05-11 | 1995-05-11 | Electronic license plate architecture |
US08/438,951 | 1995-05-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996036031A1 true WO1996036031A1 (en) | 1996-11-14 |
Family
ID=23742693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/006196 WO1996036031A1 (en) | 1995-05-11 | 1996-05-02 | Electronic license plate architecture |
Country Status (8)
Country | Link |
---|---|
US (1) | US5608391A (en) |
EP (1) | EP0826204A1 (en) |
JP (1) | JPH11505050A (en) |
KR (1) | KR19990008397A (en) |
AU (1) | AU692390B2 (en) |
BR (1) | BR9608242A (en) |
CA (1) | CA2218985C (en) |
WO (1) | WO1996036031A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP0826204A1 (en) | 1998-03-04 |
CA2218985A1 (en) | 1996-11-14 |
JPH11505050A (en) | 1999-05-11 |
CA2218985C (en) | 2007-07-24 |
BR9608242A (en) | 1999-01-12 |
US5608391A (en) | 1997-03-04 |
AU5673296A (en) | 1996-11-29 |
AU692390B2 (en) | 1998-06-04 |
KR19990008397A (en) | 1999-01-25 |
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